Yale DDV 500 electronic door viewer

Compatibility: Doors 38 - 110 mm thick | Viewfinder screen size: 3.2" | Bore diameter: 1.4 cm | Width: 128 mm | Battery type: 2 x AAA | Display diagonal: 8.13 cm (3.2") | Display type: LCD | Viewing angle: 105° | Control type: Button | Product colour: Black | Easy to install: Yes | Depth: 15 mm | Electrical viewfinder: Yes | Height: 68 mm | Warnings: Keep away from sources of heat and open flame. | Warnings: Avoid contact with liquids, may cause a short circuit or damage to the unit. | Warnings: Only suitable for use in dry and clean areas.